参数资料
型号: ADSP-BF561SKB500
厂商: Analog Devices Inc
文件页数: 43/64页
文件大小: 0K
描述: IC DSP CTRLR 32BIT 500MHZ 297BGA
产品培训模块: Blackfin® Processor Core Architecture Overview
Blackfin® Device Drivers
Blackfin® Optimizations for Performance and Power Consumption
Blackfin® System Services
产品变化通告: Product Discontinuance 27/Oct/2011
标准包装: 1
系列: Blackfin®
类型: 定点
接口: SPI,SSP,UART
时钟速率: 500MHz
非易失内存: 外部
芯片上RAM: 328kB
电压 - 输入/输出: 2.50V,3.30V
电压 - 核心: 1.25V
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 297-BGA
供应商设备封装: 297-PBGA(27x27)
包装: 托盘
配用: ADZS-BFAUDIO-EZEXT-ND - BOARD EVAL AUDIO BLACKFIN
ADZS-BF561-EZLITE-ND - BOARD EVAL ADSP-BF561
ADZS-BF561-MMSKIT-ND - KIT STARTER MULTIMEDIA BF561
ADZS-BFAV-EZEXT-ND - BOARD DAUGHT ADSP-BF533,37,61KIT
ADSP-BF561 
The time for the voltage on the bus to decay by Δ V is dependent
on the capacitive load C L and the load current I L . This decay time
can be approximated by the equation:
14
12
t DECAY = ( C L Δ V ) ? I L
The time t DECAY is calculated with test loads C L and I L , and with
Δ V equal to 0.5 V for V DDEXT (nominal) = 2.5 V/3.3 V.
The time t DIS _ MEASURED is the interval from when the reference sig-
nal switches, to when the output voltage decays Δ V from the
measured output high or output low voltage.
Example System Hold Time Calculation
10
8
6
4
2
RISE TIME
FALL TIME
To determine the data output hold time in a particular system,
first calculate t DECAY using the equation given above. Choose Δ V
0
0
50
100 150
LOAD CAPACITANCE (pF)
200
250
to be the difference between the ADSP-BF561 processor’s out-
put voltage and the input threshold for the device requiring the
hold time. C L is the total bus capacitance (per data line), and I L is
the total leakage or three-state current (per data line). The hold
time will be t DECAY plus the various output disable times as speci-
fied in the Timing Specifications on Page 23 (for example t DSDAT
for an SDRAM write cycle as shown in SDRAM Interface Tim-
REFERENCE
Figure 40. Typical Rise and Fall Times (10% to 90%) versus Load Capacitance
for Driver A at V DDEXT (min)
12
10
RISE TIME
8
FALL TIME
6
SIGNAL
4
t DIS_MEASURED
t ENA_MEASURED
t DIS
t ENA
2
V OH
(MEASURED)
V OL
(MEASURED)
V OH (MEASURED)
V OL (MEASURED) +
V
V
V OH (MEASURED)
V TRIP (HIGH)
V TRIP (LOW)
V OL (MEASURED)
0
0
50
100 150
LOAD CAPACITANCE (pF)
200
250
t DECAY
OUTPUT STOPS DRIVING
t TRIP
OUTPUT STARTS DRIVING
Figure 41. Typical Rise and Fall Times (10% to 90%) versus Load Capacitance
for Driver A at V DDEXT (max)
12
HIGH IMPEDANCE STATE
Figure 38. Output Enable/Disable
Capacitive Loading
10
8
RISE TIME
Output delays and holds are based on standard capacitive loads:
30 pF on all pins (see Figure 39 ). V LOAD is 1.5 V for V DDEXT (nomi-
nal) = 2.5 V/3.3 V. Figure 40 through Figure 47 on Page 44 show
how output rise time varies with capacitance. The delay and
hold specifications given should be derated by a factor derived
from these figures. The graphs in these figures may not be linear
outside the ranges shown.
6
4
2
FALL TIME
TO
OUTPUT
50 O
V LOAD
0
0
50
100 150
LOAD CAPACITANCE (pF)
200
250
PIN
30pF
Figure 39. Equivalent Device Loading for AC Measurements
(Includes All Fixtures)
Figure 42. Typical Rise and Fall Times (10% to 90%) versus Load Capacitance
for Driver B at V DDEXT (min)
Rev. E |
Page 43 of 64 |
September 2009
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